Laminated article



1929. R. s. BOLGER 1,723,400

LAMINATED ARTI CLE Filed 1m 6, 1925 s Sheets-Sheet 1 Aug. 6, 1329.

R. S. BOLGER LAMINATED ARTICLE Filed Aug. 6, 1925 3 Sheets-Sheet 2 Evwvmtoz 1929- R. s. BOLGER 1,723,400

LAMINATED ARTI CLE Filed Aug. 6, 1925 3 Sheets-Sheet 5 73 13 I 8140mm Patented Aug. 6, 1929.

"UNITED STATES ROBERT sLBoLGnR, or ivnw YORK, N. Y.

LAMINATED ARTICLE;

Application filed August 6, 1925. Serial No. 48,641.

The invention described in this application is an improvement on the inventions patented by me in Patent Number 1,366,336 granted J an. 18, 1921, and in Patent Number 1,445,931 granted Feb. 20th, 1923, and appertains to certain modifications and advances thereon. i

In Patent 1,866,336 is describeda-method of forming spools and the like from a specially formed blank, by spirally or straight winding the blank on itself. In Patent 1,44%,931 is described a method of forming spools and the like wherein a tube is first formed in a manner well known in the art and the tube so formed is excised to give the desired shape. The advantages of helically wound tubes in such a process is therein e:; plained.

Both of the processes described in the patents mentioned above have certain practical and manufacturing dilliculties and economic disadvantages. The spirally wound tube using the above mentioned blank has the dlsadvantage that the blank must be wound that is straight wound about a mandrel of relatively small diameter in order to build up a tube body of sutlicient thickness, and of required outside diameter and also have the required nner diameter, 'isually relatively small, which are reqiured of spools, cops, etc. This 18 a troublesome and drtlicult o1)eration. It discontinuous. Another dillicult-y lies in the slowness ot the process. 1 Spiral winding is very slow com pared to helical winding. Since the surface of the spools or cops, etc, must be biiilfod land smoothed the paper when employed must be of relatively high grade in order that it may be so smoothed and polished. It is only the layers near the surface that must of necessity be of such fineness for the purpose of polishing. This process of spiral wound spools thus entails the use a rela tively high grade paper in the body of the spools. This is an economic waste.

This method of the Patent 1,445,931 has.

also certain disadvantages. First a helically wound thatis continually wound tube when. formed into a spool will have its end flanges, whichare relatively thin: atthe top, helically wound. This gives a very weak formation and the flanges tend to tray.

and unravel. This is also true of the barrel portion of the spool, cop etc. Another disadvantage identical with the last named disadvantagein the spiral wound spool or cop formed in the method of either of the patents mentioned above is that the high grade The new process is broadly to wind a tube helically of the desired thickness and diameter and winding on the helical tube as a mandrel a second tube inspiral formation; This composite tube may then be excised to the desired form. blank which is to be wound spirally may first be prepared by cutting out certain portions so that the article may be in the rough shape when the blank is spirally wound on the helically wound tube.

Among the valuable features of this process are that I employ the advantages of speed and ease of winding on small diameter mandrels that is inherent in the helical winding together with the strengththat the spiral winding gives to the article. I may also employ because of this method a cheap stock for forming the helically wound tube and the better grade required for thesur-face in winding the spiral portion.

It is an object of my invention to excise a composite wound tube to form articles of desired shape, such as spools, cops or other shapes which may be formed by shaping 0r excising such tubes. I

' It is a further object of my invention to form a specially shaped tube by first heli-- cally winding a tube and there-upon spirally windinga specially cut out blank of desired shape, size and material.

It is a further object of my invention to form approximately tubular articles or articles formed from tubular shapes wherein the core is helically wound and the outer laminae are spirally wound.

g It is a further and more specific object of my invention to form spools, bobbins or cops or such articles by the methods above. described and hereinafter to beimore fully described wherein the core is helically 'wound and the outer-laminae of the body and flange portions are spirally wound.

It is a further object of my invention to form a composite wound tube of two different types of winding specifically helical and As a modification the spiral and particularly of a helically wound core and spiral wound outer layers.

The description will be more fully under stood by reference to the attached drawings of which 1- Fig. l. is a helically wound tube of desired length. thickness and diameter such as is adapted to form the inner core.

Fig. 2. is an end view of Fig. 1.

Fig. 3. is a view of aspecially cut out blank adapted to be spirally wound on the tube ofFig. 1 to give a tube of such shape as to give a plurality of desired shapes.

Fig. 4. is a section on line 4-4 of Fig. 3.

Fig. 5. is a view in perspective showing the helically wound core and the prepared adhesively coated blank to be wound spirally thereon.

Fig. 6. shows the completely wound tube resulting from the winding operation of Fig. 5, i. e. having a helically or continuously wound core and spirally or straight wound outer laminae and flange portions.

Fig. 7. is section on line 7-7 of Fig. 6.

Fig. 8. shows the finished spools.

Fig. 9. shows amodification wherein a noncut-out blank is wound spirally on ahelically wound core.

Fig. 10. is a phantom view of the completely wound tube showing the helically wound core, i. e. the core being continuously wound .and spirally wound, i. e. straight and well known in the art.

wound out-er laminae and flange portions.

Fig. 11. is an end view of the tube illustrated in Fig. 10.

Fig. 12. is the tube undergoing the final excising and grinding operations.

Fig. 13. is the ground and severed spools.

The figures are largely self explanatory in view of the aforegoing explanations and discussion. The core is wound helically around a mandrel of desired diameter so as to give the central opening which may be desired. Suificient number of plies are wound so as to give the desired thickness. The tube as formed moves off the mandrel laterally. This winding operation is old As the tube is formed and as soon as it reaches the desired length it is severed.

The tube must be of sufficient length to be able to act effectively as a mandrel for the next winding operation. It must also be of sufficient length so that the tube after the second winding operation shall be of desired length to give either the shape or the num-,

The barrel forming portion 1 of the blank should be at least greater than one circumference ofthe body of the spool. Preferably the length should be suificient to give several laminae of spirally wound blank. The length of the flange forming portions 2 of the blank should be sufficient to give the height of the flange portion of the spool which may be desired. The slope of the sides of the cut out trapezoids should be such as to give the desired slope to the flanges of the spools. Portion 3 of the tra-pezoids should be of such length as to give the desired length of barrel for the spool. The tabs 4 should be of such width as to hold the blank together during the winding operation. VFere this tab to be dispensed with as it may, it would increase the difficulties in the winding operation since the flange portions will not have anything to hold them in alignment. As pointed out above one of the tabs should be long enough to give several laminee, at least more than one circumference of the spool body. This tab is first wound on the helical tube when the blank is wound spirally around the helically wound tube.

\Vhile Fig. 5 shows a blank for forming a three spool tube it is obvious that any number may be formed depending on the size of the tube illustrated in Fig. land 5 and thesize of the blank and number of cut outs in Fig. 3 and 5.

lVhen the winding operation is completed the shape shown in Fig. 6 results.

The next steps are the grinding and finishing steps. There is very little grinding to do. The tabs are first cut away and the grinding tool smooths the rough parts off.

The next step is that in which the tube is severed to give the finished spool as shown in Fig. 8.

When the method illustrated in Fig. 9 is employed, a helically wound core of desir d length to give a practical size mandrel and also of desired length from which the shape or shapes may be formed, is wound in the manner and fashion described above and a blank of the length and width suficient to give the tube of required length and thick ness is spirally wound upon the helically wound core which acts as a mandrel. The shape 10 is then formed. The length of the blank in Fig. 9 must be sufficient to give the thickness of the tube in Fig. 10 when it is wound on the core in Fig. 9. Usually the core makes up the major thickness and the blank, to be wound spirally, must be of sufficient length to build up the end flanges in the case of the spool and also allow for at least one and usually more than one laminae for the body portion. This limits the amount of the better grade of paper that must be used in the outer blank to form the outer part of all of the articles to be formed thereon is of the better grade of material.

The tube thus formed may be of any desired length conditioned by the practicable size of the spiral wind and the helical wind and the use of the helical wound core as a mandrel. The number of shapes to be formed therefrom depends on the character and size of the shapes and on the size of the tube. I

The tube may be ground in any desired manner as illustrated in Fig. 12 to form the shapes specifically shown as spools. Fig. 13 shows the final shape or spools severed from the tube upon which a plurality of shapes were simultaneously formed.

While any material suitable for the winding of grinding operations here illustrated such as paper, veneer, fabrics or other sheet material may be employed, I prefer to use paper both because of its price and avail ability and also because of its workableness. It is understood that any type of adhesive or means for cementing together the 'several lamime of the tube or tubes may be used, but other means of holding the parts together may be used, such as bands, either alone or in addition to the adhesive material.

I prefer to use adhesive in forming the tubes and to use the bands additionally when this proves advisable.

lVhile I have thus specifically described my invention in accordance with law I do not desire the same to be taken as limiting the invention but only illustrative of the invention which I claim is 1. The method of forming laminated articles having more than one external diameter which comprises helically winding a tube of sheet material to form a tube of an external diameter not greater than a minor diameter of the said article and spirally winding on said helically wound tube a blank of sheet material, the thickness of said spiral winding being at least suflicient to form on said helically wound tube the maximum external diameter of said article.

2. The method of forming laminated articles having more than one external diameter which comprises helically winding a core of a diameter less than a minor diameter of the article to be formed and spirally winding on said core outer layers of a thickness to form at least the maximum diameter of said article.

3. The method of forming laminated articles which comprises forming a composite wound tube by helioally winding a tube of sheet material to form a tube of desired shape and size and spirally winding on said helically wound tubeas a mandrel a blank of sheet material and grinding said composite wound tube to desired shape.

4.. The method of forming laminated articles which eon'iprises helically winding a tube of sheet material. to desired size, spirally winding on said helically wound tube as a mandrel a blank of sheet material to give a composite wound tube and excising said composite wound tube to form a desired shape.

5. The method of making laminated spools which comprises helically winding a tube of sheet material to give a helically wound tube of desired shape and spirally winding on said helically wound tube as a mandrel a. blank of sheet material to give a composite tube of desired size and excising said latter tube to give a plurality of spool shapes and severing said shapes to give individual spools.

6. The method as described in claim 5 in which the sheet material employed is paper of desired grade.

7. The method of forming laminated articles which compri es helically winding a tube of sheet material to give a tube of desired size, forming a blank of sheetinaterial by cutting out portions thereof in order to give approximately the desired shape when the blank spirally wound on said helically Wound tube as a mandrel, winding said blank on said helically wound tube to give 'a plural wound tube-like shape comprising an inner helically wound core and outer laminae spirally wound.

8. In the method defined in claim 7, I

grinding said plural wound tube-like shape to form a smooth tube-like shape of the desired fashion.

9. The process of forming laminated spools which comprises helically winding a tube of sheet material-about a mandrel of a size to give the desired central opening of the spool and continuing the winding operation until. a tube of desired length at least equal to the sum of the lengths of spools to be formed therefrom and diameter is formed, severing the tube as it comes off the mandrel, forming a blank of a width approximately equal to the length of the aforementioned tube and of a length suflicient to give the maximum diameter of the spool when the blank is wound on said helicall-y wound tube, cutting out of said blank a number of trapezoids equal to the number of the spools to be formed from'said blank,

the minimum width of the tra 'iezoids being equal to the length of the barrel portion of said spool and the slope and perpendicular height of the sides of said trapezoidal cutouts being such as to give the desired height and slope to end the portions of the spools formed, said trapezoidal cut-outs being so formed as to be entirely within the edge port-ions of the blank so as to term connecting tabs between said trapezoids, the width of one of said tabs being greater than one outer circumference of the spools. spirally winding" said blank on said helically wound tube as a mandrel in such manner that the lastmentioned tab is first wound thereon thus forming a plurality of spool shapes equal to the number of trapezoidal outouts, grinding said shapes to desired thickness and smoothness and then severing; said spool shapes to give individual finished laminated spools having an inner helically wound core outer layers spirally wound and spirally wound end flanges.

10. In the method as defined in claim 9, in which the material used is paper of desired quality.

11. A laminated spool comprising a helically wound core and spirally wound end flanges.

v12. A laminated paper spool comprising a helically wound core and the outer laminae of the barrel portion of the spool spirally wound and spirally wound end flanges.

13. The method of tormin laminated articles having more than one external diameter which comprises helically winding a tube to a diameter less than a minor external diameter of the article to be formed and spirally winding on said helically wound tube as a mandrel a blank of sheet material to build up on said helically wound tube a thickness to form at least the maximum external diameter of the article to be formed and excising said tube to the desired shape.

1st. The method of forming laminated articles having more than one external di ameter which comprises helically winding a tube to a diameter less than a minor eX- ternal diameter of the article to be "formed and spirally "inding on said helically wound tube as a mandrel a blank of sheet material to build up on said helically wound tube a thickness to form at least the maximum; external diameter of the article to be formed and excising said tube to give a plurality of spool shapes and severing said shapes to form individual spools.

15. The method of forming laminated spools which comprises helically winding a tube of sheet material to thickness less than the diameter of the barrel of the spool, spirally winding on said helically wound tube sheet material to form at least the maxin'nun diameter of the spool and excisine' said tube to the desired spool shapes.

In testimony whereof I afiix my signatul e.

ROBERT s) BOLGER. 

